First I simulated only the pipes, the result was stable. I am simulating a strong looped sewer system with about 450 pipes, one pump, several storages and 4 overflows.Is this right? I hope the water flowing through 999 will leave from the sewer system? is this so?.If pump discharge goes to a wastewater treatment plant, which does not belong to the sewer system, so I give a number 999 to NJUNC(N,2), the D1 lines contain the junction 999 also, but in the C1 lines there is no conduit between NJUNC(N,1) to H1 line asks for NJUNC(N,1) and NJUNC(N,2).One of extran file says that enter PON(I) and POFF(I) only if IPTYP=3, but Addendum of EXTRAN says if IPTYPE=2 or 3! Why?.H1 line asks for lower, mid- and high pumping rate, if I have only one pumping rate (I don't know which it is), the so-called pumping capacity, then how can I give the values of PRATE(I,1), PRATE(I,2) and PRATE(I,3)? Can I set the first two to 0 and the third to pumping capacity?.what is the difference between an off-line pump and an on-line pump?.
Would you explain something about using EXTRAN block of SWMM4.3?
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